Correlation of charm particles from gluon-gluon fusion in hadronic collisions

In the framework of fusion process, ≈90% of which isg+g→c+ c, we have calculated rapidity correlation andp _T ^/2 of charm particles produced in hadronic collisions. The experimental observation of rapidity correlation by the LEBC-EHS Collaboration is in good agreement with the calculation. From the ratio of double to single charm production an estimate of fusion cross section is made.